of joliet



March 25, 1930. c, M, IBBLE 1,751,798

FLUE CONSTRUCTION Filed Aug. 4, 1928 Patented 'Mar. 25, 1930 UNITED STATES PATENT OFFICE CLAUDE M. DIBBLE, or JOLIET, I'LLINo s, ASSIGNOR TOMOOB-E nnornnns COMPANY, or JOLIET, ILLINOIS, A CORPORATION on ILLINOIS of the desirability of preventingback draft" BLUE CONSTRUCTION Application filed August 4, 1928. Serial No. 297,460.

This invention relates to a flue construction, and has for its general object to provide a fine by which back draft is prevented in a stove or other heater with which the flue is connected, but without material impairment of the normal forward draft from the stove through the'flue, and which has a multiple capacity for being connected with various predetermined positions of the stack flue that discharges the exhaust gases from the stove into the outsideatmosphere, yetwithout impairing the efiiciency of operation of the flue in preventing such back draft.

Numerous other objects of the invention will be apparent as it is better understood from the following description, which, taken in connection with the accompanying drawings, discloses a preferred embodiment thereof. a v In the drawings: v Figure 1 is a side elevational view, showing one form of flue constructed in'accordance with the invention applied to a cabinet type of stove, such as is shown and described in -my companion application [for Letters Patent of the United States,for' stove con' struction, filed by me oneven date herewith, the serial'number of which is 297,458.

Fig.2 is a longitudinal vertical section taken throughthe flue, shown inF-ig. 1; and

Fig. 3 is an end elevation of'the' flue construction, looking from the left and toward the right of Fig. 2. I

The illustrative flue construction may be applied to various typesof stovesand heaters for carrying off the exhaust gases to the chimney or stack and discharging'them from the stove or heater into the outer atmosphere.

In the drawings, the flue construction is conne'ctedto the outlet of a cabinet'type of gas stove 11. This constitutes one important application of the invention, not only because and possible extinguishment of the flame of gaseous fuel stoves, owing to the inherent danger involved as a result of'accidentally extinguishing the fire, but also on account of the ready adaptabilityof the flue construe tion to several predeterminedpositions of the stack or chimney.

V The illustrative flue construction includes ahorizontal flue pipe 12, the inlet end 13 of which is mounted on the exhaust pipe 14: of the stove or heater 11. This exhaust pipe let-may, if desired, project. from one of the side walls of the stove, and be provided with a flanged or recessed end 15 of relatively smaller diameter to receive the overlapping end 16 of larger diameter of the horizontal flue pipe 12. After said flue pipe 12 has been mounted on the exhaust pipe 14:, it may be secured in position thereon by a bolt and nut assembly. 17 passed through aligned holes in the overlapping end and flanged end respectively of the. flue pipe 12 and exhaust pipelt.

The i" proved flue construction adapted for attachment either. to a verticallyposi tioned stack or chimney-18 oran alternatively.

positioned horizontal 'stack, indicated in dotted lines at 19. V For this purpose, a short vertical p pe section 20 is mounted over-the top of the flue 12 and communicates with the interior of said flue. The outer end of the horizontal flue 12 is left open, when it is desired to connect said flue 12with a horizontally positioned stack, such as indicated in dotted lines at 19. In either case, the stack or chimney flue, such as 18 or 19, may be pro- I vided withian inwardly'flanged or recessed end 21 for insertion, as the predetermined a location of the stack demands, into either the short vertical pipe section 20 or the open end of the horizontal flue pipe 12. v r

After the fluepipe 12 has been connected with thestack flue, the unconnected opening may beclosed by a cover 22 which is adapted for insertion into the open end of either the p1pe'12 or the'vertical pipe section20; In 3 Fig. 2, the stack flue" pipe 18 is connected with the vertical outlet 20 of the flue pipe 12, andthehorizontal outlet 28 thereof is closed by theicover plate 22. On the otherqhand, in the alternative arrangement, the cover 22 is removed from the horizontal outlet 23 and the horizontalv stack flue 19 inserted in its place. The cover 22, in this second arrangement, is applied to the vertical outlet provided by the short vertical pipe section 20, as

indicated by dotted lines inFig. 2.

tical pipe section 20, with said horizontal pipe 12, is a baffle plate 24, secured, for example, by riveting it at 25 to ears 26 inwardly projecting from the opposite sides of the pipe 12, as shown in Fig. 3. These ears 26 may be, if desired, themselves riveted at 27 to the inner surface of the wall of the pipe 12.

The baflie 24 is disposed at such an angle within the pipe 12 that it would bisect the angle formed with hypothetical currents of gases flowing simultaneously backwards through the pipe 12 and the vertical pipe 20 and meeting in front of the balfle 24. Inasmuch as in the illustrative embodiment, the axis of the pipe 20 and its outlet is substantially vertical, and the axis of the pipe 12 and its alternative outlet 23 is substantially horizontal, the hypothetical meeting currents of backwardly flowing gases would come to-,

gether at an angle of substantially 90.

Hence, the baflle 24, in this arrangement, is

positioned below the inlet of the pipe 20 at an angle of substantially to the axis of said pipe 20, and also at an angle of substantially 45 to the axis-of the pipe 12. Therefore,

in the event thatany tendency should develop for a back draft to flow through either the vertical discharge pipe 20 or the horizontal discharge end 23 of the pipe 12, the baflle, because of its angularity, would intercept back'draft, coming either vertically or horizontally, at substantially the same angle and thus is equally eflective to arrest such back draft, whether the flue pipe 12 be connected to a'vert-ical or alternatively to a horizontal stack flue or chimney. 7

The illustrative flue construction also providesfor augmenting the draft in the forward or discharging direction. in order to olfsetany tendency which thebaflie 24 might have toward choking or impairing the draft.

' As shown in Figs. 2 and 3, the bottom of the pipe 12 is provided with a cut-away opening 41, formedby cutting out the metal of the pipe 12 circumferentially along the lines 42 below. the baffle 24 .and next along the lines 43 whichle'xtend substantially parallel with theaxis of the pipe 12 and join the terminals of the circumferential cuts 41. Intothe opening 41;.thus provided, a l-ateral box-like back pressure outlet flue 28 is inserted. This flue 28 is provided withstraight vertical side ,walls 29 joined together below the bottomof the pipe 12 by a substantially horizontal bottom 30. The side walls 29 of the outlet'flue project within thepipe 12 above thehorizontal edges 43 of the opening 41and are riveted to the inner surface of the pipe wall, for example, as shown at 31. The forward end of saidoutlet flue 28 is open below the bottom of the pipe 12 to provide an outlet 32 for back draft, but the rear end; of] said flue is closed by a In the event of back-draft occurring, the battle 24 would arrest such back-draft and cause it to be deflectedfrom passing into the stove through the pipe 14, so that the backdraft would pass into the interior of the room through the outlet 32 instead of going back to'the burner in the stove 11 and putting out;

the fire. Moreover, the existence of backdraft would be at once detected by the occupant of a room in which the stove or heater is operating, on account of the unpleasant odor of the noxious burned gases. This would signal for a temporary suspension of the operation of the stove or heater.

7 It is thought that the invention and many of its attendant advantages will be under stood from the foregoing description, and it willbe apparent thatvarious changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

lclaimz' V 1. Aflue'construction, comprising a flue pipe having an inlet and a plurality of outletsyindividually .connectible to a chimney,

and means associated with said flue pipe for diverting back draft of each said outlet from said inlet. r F

2. A flue construction, comprising a flue pipe having aninlet and a plurality of outlets individually connectible to ,a chimney,

means associated withsaid flue pipe for diverting back draft of either-said outlets from said inlet,and a closure independently connectible to said outlets. i

3. A flue construction, comprisinga flue pipe having an inlet openingandoutlet openings angularly arranged with respect to-each other and separately usable, and a b ack draft preventer common to said outlets. 4. Aflue construction, comprising a flue pipe having an inlet opening andoutlet open ingsangularly arranged with respect to each other and separately usable, and a back draft preventer common to said outlets, said back draftpreventer comprising a balfie fixed in angular relation to the axes of said outlets.

5. A flue construction, comprising a flue pipe having an inlet opening, a plurality of outlet chimney openings and aback draft outlet opening, and a bafliefor directing back draft from said plurality of chimney outlet openings through said back outlet opening.

6. A flue construction, comprising a flue,-

pipe having an inlet opening, a plurality of outlet chimney openings and a back draft outlet opening, a baflle for directing .back

draft from said plurality of chimney outlet Openings through said back draft outlet opening, and means arranged at said back draft outlet opening for directing flue gases from said inlet opening to each said chimney outlet openings.

7. A flue construction, comprising a flue pipe having an inlet and a plurality of out lets, and means associated With said flue pipe for diverting back draft from said inlet through said outlet.

CLAUDE M. DIBBLE. 

